Tetra External Carbon Filter Medium 4 pack

Keep your aquarium water clean, clear and healthy with Tetra Medium Aquarium Carbon Filter. Fish waste, uneaten food and other organic matter can cause toxic levels of ammonia and other pollutants which can be harmful to your fish. Tetra Medium Aquarium Carbon Filter is made of layers of multi-density floss that effectively trap even the smallest particles and its activated carbon rapidly eliminates odor, discoloration, impurities and toxins.